Method for compression and decompression of image data
CA 2441372 C · Owner: Mossakowski, Gerd · Inventors: Mossakowski, Gerd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for compression and decompression of pixelbased image data. Each pixel first has the pixel value determined. A pixel difference value is then determined for each pixel from a given number of , neighbouring pixels which results from the difference in the pixel value for the pixel in question to each of the neighbouring pixels thereof. The pixel difference values are then sorted in descending order. Each pixel used for the calculation of a pixel difference value is assigned to a pixel group. The pixel groups obtained thus are stored according to the descending sorting of the pixel difference values. For regeneration of the image the pixel groups with …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 19, 2002 and granted October 9, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.